Monitor recommends ONLY K1. We have a sub forum for Monitor heaters in the HVAC section. There are others there that can be of more help that me. I have a Monitor that's 21 years old, always been run on K1 and has only needed the burn chamber rebuilt once since new. I think Hawkins111 in the Monitor forum is a dealer, he can probably give you an idea what kind of damage has been done using the #2 diesel and how to remedy it.
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